huixiang_app/lib/mine/roll_center_page.dart

import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:huixiang/generated/l10n.dart';
import 'package:huixiang/retrofit/data/base_data.dart';
import 'package:huixiang/retrofit/data/coupon.dart';
import 'package:huixiang/retrofit/data/page.dart';
import 'package:huixiang/retrofit/retrofit_api.dart';
import 'package:huixiang/view_widget/coupon_widget.dart';
import 'package:huixiang/view_widget/item_title.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:shared_preferences/shared_preferences.dart';

class RollCenterPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _RollCenterPage();
  }
}

class _RollCenterPage extends State<RollCenterPage> {
  RefreshController _refreshController;

  ApiService apiService;

  @override
  void initState() {
    super.initState();

    SharedPreferences.getInstance().then((value) => {
          apiService = ApiService(Dio(), token: value.getString('token')),
          queryCoupon(),
        });

    _refreshController = RefreshController(initialRefresh: false);
  }

  int pageNum = 1;
  List<Coupon> coupons = [];

  queryCoupon() async {
    BaseData baseData = await apiService.queryCoupon({
      "centre": true,
      "pageNum": pageNum,
      "pageSize": 10,
      "searchKey": "",
      "state": 1
    }).catchError((error) {
      _refreshController.loadFailed();
      _refreshController.refreshFailed();
    });
    if (baseData.isSuccess) {
      PageInfo pageInfo = PageInfo.fromJson(baseData.data);
      if (pageNum == 1) {
        coupons.clear();
      }
      coupons.addAll(pageInfo.list.map((e) => Coupon.fromJson(e)));
      setState(() {
        _refreshController.refreshCompleted();
        _refreshController.loadComplete();
        if (pageInfo.pageNum == pageInfo.pages) {
          _refreshController.loadNoData();
        } else {
          pageNum += 1;
        }
      });
    } else {
      _refreshController.loadFailed();
      _refreshController.refreshFailed();
      Fluttertoast.showToast(msg: baseData.msg);
    }
  }

  void _onRefresh() async {
    pageNum = 1;
    queryCoupon();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          "领卷中心",
          style: TextStyle(
            color: Colors.black,
            fontWeight: FontWeight.bold,
          ),
        ),
        centerTitle: false,
        backgroundColor: Color(0xFFF7F7F7),
        elevation: 0,
        leading: GestureDetector(
          onTap: () {
            Navigator.of(context).pop();
          },
          child: Container(
            alignment: Alignment.centerRight,
            margin: EdgeInsets.only(left: 10),
            padding: EdgeInsets.all(6),
            child: Icon(
              Icons.arrow_back_ios,
              color: Colors.black,
              size: 24,
            ),
          ),
        ),
        titleSpacing: 2,
        leadingWidth: 56,
      ),
      body: Container(
        child: Column(
          children: [
            ItemTitle(
              text: S.of(context).keyongyouhuiquan,
              imgPath: "assets/image/icon_card_coupon.png",
              moreText: S.of(context).chakanwodekabao,
              onTap: () {
                Navigator.of(context).pushNamed('/router/mine_card');
              },
            ),
            Expanded(
              flex: 1,
              child: Container(
                child: SmartRefresher(
                  enablePullDown: true,
                  enablePullUp: true,
                  header: ClassicHeader(),
                  footer: CustomFooter(
                    builder: (context, mode) {
                      Widget body;
                      if (mode == LoadStatus.idle) {
                        body = Text("pull up load");
                      } else if (mode == LoadStatus.loading) {
                        body = CupertinoActivityIndicator();
                      } else if (mode == LoadStatus.failed) {
                        body = Text("Load Failed!Click retry!");
                      } else if (mode == LoadStatus.canLoading) {
                        body = Text("release to load more");
                      } else {
                        body = Text(S.of(context).meiyougengduoyouhuiquan);
                      }
                      return Container(
                        height: 55.0,
                        child: Center(child: body),
                      );
                    },
                  ),
                  controller: _refreshController,
                  onRefresh: _onRefresh,
                  onLoading: queryCoupon,
                  child: ListView.builder(
                    itemBuilder: (context, position) {
                      return CouponWidget(coupons[position], () {});
                    },
                    itemCount: coupons.length,
                  ),
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}